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#6: 10-24-2010, 12:04 PM
I have this too and
 
 PCvillain
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Location: Oly Beer Area
Car: 05 LGT Waggie, 93 L Waggie, 02 Yukon XL
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It's not a normal noise. This is not the starter or other starting only equipment. It's kind of a scrapping and squeal in the first .5 second till oil pressure is up. Could be other pump like steering or brake but I only get this when I start the engine after at least an overnight sit.

I wonder if it's the first seconds worth of oil starvation?

I don't know if these engines keep pressure on the filter as some cars do to reduce time to prime and pump oil at start-up.

I don't like the sound but not much to do about it.